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Android perfetto 工具简单使用

官方文档：https://developer.android.google.cn/tools/perfetto?hl=zh-cn

1. perfetto 工具默认是关闭状态需要手动开启，可以从settings中开启或者写系统属性开启

adb shell setprop persist.traced.enable 1

2. 开启后可查看服务是否启动：ps -A | grep traced

msm8953_64:/ # ps -A | grep traced
nobody       15225     1   52372   3024 poll_schedule_timeout 0 S traced
nobody       15226     1   52372   2904 poll_schedule_timeout 0 S traced_probes
msm8953_64:/ #

3. 控制命令介绍

   控制命令	解释	备注
   –background | -d	立即退出命令行界面，并继续在后台记录您的跟踪数据
   –config | -c	自定义配置文件	protobuf格式
   –out | -o	保存的文件
   –dropbox TAG	Upload trace into DropBox using tag TAG
   -t+time	检测时长
   –no-guardrails	Ignore guardrails triggered when using --dropbox (for testing)
   –txt	Parse config as pbtxt. Not a stable API. Not for production use.
   –help | -h	帮助
   –time | -t	Trace duration N[s,m,h] (default: 10s)	时长需要跟单位
   –buffer | -b	Ring buffer size N[mb,gb] (default: 32mb)
   –size | -s	Max file size N[mb,gb] (default: in-memory ring-buffer only)
   ATRACE_CAT	Record ATRACE_CAT (e.g. wm)
   FTRACE_GROUP/FTRACE_NAME	Record ftrace event (e.g. sched/sched_switch)
   FTRACE_GROUP/*	Record all events in group (e.g. sched/*)
   –alert-id	ID of the alert that triggered this trace.
   –config-id	ID of the triggering config
   –subscription-id	ID of the subscription that triggered this trace
   –detach=key	Detach from the tracing session with the given key
   –attach=key [–stop]	Re-attach to the session (optionally stop tracing once reattached)
   –is_detached=key	Check if the session can be re-attached (0:Yes, 2:No, 1:Error)

4. 常用模块介绍

   模块	模块介绍
   sched	跟踪CPU调度、上下文切换等内核事件‌
   freq	记录CPU频率动态调整过程‌
   idle	监控CPU进入/退出低功耗状态‌
   am	追踪Activity启动、生命周期等应用管理事件‌
   wm	记录窗口管理、Surface布局等图形层操作‌
   gfx	分析UI渲染、VSync信号、GPU活动‌
   view	跟踪View绘制、测量、布局流程‌
   binder_driver	监控进程间通信的Binder调用‌
   hal	记录Camera/Audio/Sensor等HAL层调用‌
   dalvik	追踪ART/Dalvik的GC、JIT编译等事件‌
   camera	分析相机开启、预览、拍照等流程耗时‌
   input	记录触摸、按键等输入事件处理‌
   res	跟踪内存/IO资源分配释放‌
   memory	监控内存压力、OOM事件等‌

   如：perfetto -o /data/trace.perfetto-trace -t 10s sched freq idle am wm gfx view binder_driver hal dalvik camera input res memory

5. 抓取指定的时候后会自动停止，将文件导出可在：https://ui.perfetto.dev/#!/record地址导入后查看